Staybolt structure



J. R. FLANNERY AND E. L DODDS.

STAYBOLT STRUCTURE.

' APPLlCATlOH FILED JULY 2, 19:9.

Patented Oct. 5, 1920.

UNITED STATES JOHN ROGERS FLANNE Y AND ETHAN PATENT OFFICE.

I I I. DODDS, OF PITTSBURGH, PENNSYLVANIA, ASSIGNORS TO PLANNER? BOLTCOMPA .N 2?, OLE EITTSBURGH, PENNSYLVANIA.

. STAYBOLT STRUCTURE.

Specification of Letters Patent.

Patented Got. 5, 1920.

Application filed July 2, 1919. Serial No. 303.120.

T0 aZZ w from it may concern Be it known that we, JOHN Roenns FLAN- NERYand ETHAN I. Donns, citizens of the United States, and residents ofPittsburgh, in the county of Allegheny and State of Pennsylvania, haveinvented certain new and useful Improvements in staybolt Structures; andwe do hereby declare the following to be a full, clear, and eXactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to improvements in staybolt structures for steamboilers and 5 more particularly to mounting the head of the staybolt andthe means for capping the same,the object of the present invention beingto provide a simple staybolt structure embodying a bearing sleeve forthe head of the bolt and a cap or closure, which latter shall havedetachable engagement with the boiler sheet inwardly from the outer faceof the latter and a short distance from the opening in the boiler sheetthrough which the bearing sleeve passes, whereby the cap may beremovably secured to the boiler sheet to inclose the bolt head and itsmounting, without the use of bolts or rivets or other securing meanswhich would overlie the outer face of the boiler sheet.

With this and other objects in view, the invention consists in certainnovel features of construction and combinations of parts as hereinafterset forth and pointed out in the claims.

The accompanying drawing is a sectional view illustrating an embodimentof our invention.

1 represents a portion of an outer boiler sheet having a threadedopening 2 through which a section of an externally threaded bearingsleeve 3 passes. The sleeve 3 is made interiorly with a concave seat 42for the rounded head 5 of a staybolt 6 and a portion of the bore of thesleeve, inwardly from the seat 4, is made tapering, as shown at 7, topermit lateral play of the staybolt. In the drawing, the bearing sleeve3 is shown projecting beyond the planes of both the inner and outerfaces of the boiler sheet, but a shorter sleeve might be employedwithout detracting from the efliciency of the sleeve as a bearing memberfor the head of the stay bolt. In fact, the hearing sleeve mightterminate at its outer end practically flush with its mounting, so asthe plane of the outer face of the boiler sheet.

is important that the head of the staybolt and its mounting shall beeffectually closed steam tight, and in order to accomplish this and atthe same time facilitate the ready attachment of a closure to and itsdetachment from the boiler sheet independently of the staybolt mounting,the features now to be described are employed: An annular groove 8 ismade in the outer face of the boiler sheet and encircles the opening 2,said groove being spaced a short distance from said opening. One wall ofthe groove 8 (preferably the wall farthest removed from the opening 2and bearing sleeve 3) is threaded as at 9. A cap or closure 10 isdisposed over the head of the staybolt and to inclose the same and theedge portion of said cap or closure enters the annular groove, said capor closure having a threaded portion 11 near its edge to mesh with thethreaded wall of the groove and a washer 12 may be disposed be tween theedge of the cap and the bottom of the grooves. The cap or closure isthus removably secured to the boiler sheet inwardly from the plane ofthe outer face of said boiler sheet. The cap or closure may behemi-spherical in shape and provided with an enlargement 10 to receive awrench.

Having fully described our invention what we claim as new and desire tosecure by Letters-Patent, is

1. In a staybolt structure, the combination with a boiler sheet havingan opening, and a mounting for the head of a staybolt, said mountingentering the opening in the boiler sheet, of a cap or closure for saidmounting having threaded connection with the boiler sheet.

2. In a staybolt structure, the combination with a boiler sheet havingan opening, and a mounting for the head of a stay-bolt said mountingthreaded through the opening in the boiler sheet, of a cap or closurefor said mounting having threaded COI111BC tion with said boiler sheetinwardly from the outer face of the latter.

3. In a staybolt structure, the combination with a boiler sheet havingan opening and also having an annular groove encircling said opening,said groove having a threaded wall, of a mounting for the head of astaybolt, said mounting having threaded connection With the Wall of theopening in the boiler sheet, and amp or closure entering the annulargroove in the boiler sheet and having a threaded portion to engage thethreaded Wall of said groove. 7

4. In a staybolt structure, the combination of a boiler sheet having anopening and also having an annular groove surrounding said opening and,spaced. from the latter, said annular groove having a threaded Wall, abearing'sleeve threaded through said opening, a staybolt having a headmounted in said bearing sleeve, and a cap 'inclosing the head of thestay-bolt, the edge portion of the cap entering the annular groove inthe boiler sheet and having a threaded portion to engage the threadedWall of said groove.

In testimony whereof, We have signed this specification in the presenceof two subscribing Witnesses.

JOHN ROGERS FLANNERY. ETI-IAN I. DODDS.

Witnesses:

JAMES R. HORAN, EDWIN S. Bron.

